Adjustable clamp for concrete forms



March 27, 1951 H. B. CAIN ADJUSTABLE CLAMP FOR CONCRETE FORMS Filed June 11 6 2 Sheets-Sheet l gum/#04360;

March 27, 1951 H. B. CAIN ADJUSTABLE CLAMP FOR CONCRETE FORMS Filed June 11, 1946 2 Sheets-Sheet 2 Patented Mar. 27, 1951 UNITED STATES PATENT OFFICE ADJUSTABLE CLAMP FOR CONCRETE FORMS 2 Claims.

This invention relates to a locl: for concrete forms, and more particularly, to a metallic structure adapted to retain concrete forms in position about columns, pilasters, beam and. the like.

A primary object of this invention is the provision of an improved retaining means or look for concrete forms constructed of metal tubin or the like which may be readily adjusted to accommodate a variety of shapes and sizes of forms,

and re-used repeatedly in a variety of situations.

A further object of the invention is the provision of such a device characterized by tubular sliding members and guide means for the sliding members, slotted apertures being provided in both the guides and the tubular members whereby keys I may be inserted to lock the component parts in a desired position.

A still further object of the invention is the provision of such a construction which. will he sturdy and durable, reliable and efficient in operation, and relatively simple and inexpensive to manufacture, assemble and utilize.

Other objects reside in the combinations of elements, arrangements of parts, and features of construction, an as will be more full pointed out hereinafter and shown in the accompanying drawings, wherein there are shown preferred embodiments of this inventive concept.

In the drawings:

Figure 1 is a side elevational view of one form of device embodying features of the instant invention shown as applied to a form utilized in the construction of a concrete beam or pilaster, the latter being shown in section.

Figure 2 is an enlarged fragmentary side elevational view of details of construction disclosed in Figure l. v

Figure 3 is an enlarged fragmentary view of a constructional detail, showing an adjustment permitting relatively fine positioning of the device.

Figure 4 is a perspective view of one of the keys used in looking the a paratus.

Figure 5 is a View similar to Figure l, but showing a modification in the use and assembly of the device.

Figure 6 is a top plan view of an alternative use of the device, as adapted for use with co1= umns, the latter being shown in section.

Figure '7 is a fragmentary sectional view taken there is generally indicated at l t a concrete beam or pilaster in the process of formation surrounded by the customary side and bottom form boards II and 12, respectively. The side boards II are adapted to be held in position by vertically positioned tubular rods 53 each provided with a pair of oppositely aligned series of longitudinally extending and longitudinally spaced rectangular slots H5 at suitable intervals thereon. Surrounding each of the tubular rods it is a collar or sleeve iii to which is welded, or suitably secured at right angles thereto, a second tubular collar or sleeve 16 oppositely slotted, as at ll. The sleeves 45 are also oppositely slotted, a at E8, the series of slots I2 and 13 corresponding in disposition, spacing and configuration to the slots I 4. Tubular sleeves l5 and it are positioned substantially at right angles to each other, and if desired, reinforcing members 59 may extend between the extremities of the right angularly disposed sleeves. A tubular rod 20 provided with slots 26 is adapted to be passed throughv the horizontal sleeves Hi, and underlie the baseboard l2.

Keys 2| of tapered configuration, as best shown in Figure l, are adapted to be passed through registering slots in tubular sleeves it and 20, and similar keys are adapted to be passed through the slots is in sleeves l5 and similar slots I? in the rods l3.

It will now be seen that the Sideboards ll and bottom or baseboards :2 are firmly supported and secured in "aligned position about the beam iii after the keys 2! have been suitably positioned.

Suitable means 22 may be provided for supporting the assembly, in which case the vertical rods l3 have suitably secured to their upper extremities right angularly extending portions 23. If desired, reinforcing side plates 24 may be welded or otherwise suitably secured to protect and reinforce the juncture of the rods I3 and portions 23.

In instances where relatively precise adjustments are essential, a supplemental collar member 25, as best shown in Figure 3, may be utilized in association with a rod and sleeve, as for example, !3, and its surrounding sleeve, as for example, !5. The collar 25 is provided with a plurality of slot-like notches 28, 2'! and 28 in the lower edge thereof, the notches being graduated in depth, whereby upon rotation of the collar 25 until a suitable notch 26, 21 or 28 is in registry with the slot M, a key 2! may be inserted to support the device at a desired height within relatively close limits in a selected slot.

A modified form of construction is disclosed in Figures 5 and 7, wherein a beam ID is provided with side plates II and a base plate l2, the latter being supported by shoring 30 having a supporting upright 3| and reinforcing diagonal members 32. Inthis modified form of construction, rods I3 including slots 14 are adapted to pass through sleeves 15 having slots [8 therein substantially identical in configuration to the previously discussed modification. In this construction, however, semi-cylindrical channel members 35 are substituted for the horizontal sleeves i6 and include laterally directed slots 36 thereon adapted to engage keys 2!, which in turn engage in suitable slots in a tubular member 26. The open construction of the semi-circular channel member may be utilized to facilitate disassembly of the device, and is particularly adaptable to a construction such as is shown in Figure 6, and which will be more fully described hereinafter.

Figure 6 discloses a method of using the looking members including the sleeves i5 and the channel members in association Witha column 36 of rectangular configuration. In this form of construction, the locking members are adapted to be positioned at diagonally opposite corners of the column 38, and a rod 31' provided with,

slots 38 is adapted to be passed through one of the tubular members I5. The rod 31 is pivotally connected, as by a pivot pin 39, to a similar rod d6 having slots right angularly disposed sleeve 55, a similar key 2i being provided to lock the parts in related assembly. A second end identical rod 31 including a pivotal connection 39 to a second rod 42 is adapted to be seated in the channels of the members 35 of each of the two interlocking devices, and held in position, as by keys 21.

From the foregoing it will now be readily apparent that the forms and locking device therefor hereinabove described may be readily adapted to a relatively wide variety of uses, and may be adjusted to accommodate concrete forms used with pilasters, beams, columns, or the like, of a relatively large variety of sizes, precise adjustments being permitted by the use of sleeves, as

previously described.

It will also be seen that there is herein provided a device which accomplishes all the objects of this invention, and others, including many advantages of great practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as many modifications may be made in the embodiment hereinbefore shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrative and not in a limiting sense.

I claim:

1. An adjustable clamp for concrete forms comprising a pair of cylindrical rods arranged in spaced confronting relation with respect to each other and adapted to abut opposite sides of a concrete form, each of said rods being provided with. a plurality of slots extending therealong and spaced from each other, a tubular sleeve circumposed about each of said rods and slidably supported thereon, a collar having one end arranged in end to end abutting relation with respect to each of said sleeves and rotatably and slidably supported on each of said rods, the other end of each of said collars being provided therein adapted to engage 9g with a plurality of circumferentially spaced notches of varying depths, said notches being selectively alignable with a select slot of each of said rods, a key insertable in each of said aligned notches and slots to lock each of said collars sleeves in a select position relative to each of said rods, a second transversely disposed tubular sleeve superposed upon each of said first named tubular sleeves and secured thereto, a rod extending through said confronting tubular sleeves and slidably supported therein in abutting relation with the adjacent end wall of said concrete form, and means engageable with each of said second named sleeves and said second named rod for holding the pair of cylindricai rods in a select spaced position relative to each other.

2. An adjustable clamp for concrete forms comprising a pair of cylindrical rods arranged in spaced confronting relation with respect to each other and adapted to abut opposite sides of a concrete form, each of said rods being provided with a plurality of slots extending therealong and spaced from each other, a tubular sleeve circumposed about each of said rods and slidably supported thereon, a collar having one end arranged in end to end abutting relation with respect to each of said sleeves and rotatably and slidably supported on each of said rods, the other end of each of said collars being provided with a plurality of circumferentially spaced notches of varying depths, said notches being selectively alignable with a select slot of each of said rods, a key insertable in each of said aligned notches and slots to lock each of said collars and sleeves in a select position relative to each of said rods, a second transversely disposed tubular sleeve superposed upon each of said first named tubular sleeves and secured thereto, a rod extending through said confronting tubular sleeves and slidably supported therein in abutting relation with the adjacent end wall of said concrete form, and means engageable with each of said second named sleeves and said second named rod for holding the pair of cylindrical rods in a select spaced position relative to each other, said last named means comprising another key insertable through aligned slots provided in each of said last named sleeves and the adjacent portions of said last named rod.

HOWARD B. CAIN.

REFEREIWJES CITED The following references are of record in the Schenk Sept. 1, 1942 

